Bror hemming wesslau and georg trautwein



(No Model.)

B. H. WESSLAU & G. TRAUTWEIN.

JOINT FOR COUPLING UNDERGROUND GABLES. No. 415,751.

Patented Nov. 26, 1889.

WITNESSES 0$M $mwf N. PETERS. Fhala-ulnogupher. Washinglnn. n. c,

UNITED STATES PATENT OFFICE.

BROR HEMMING VVESSLAU AND GEORG TRAUTIVEIN, OF CIIARLOTTENBU RG, PRUSSIA, ASSIGNORS TO SIEMENS & IIALSKE, OF BERLIN, GERMANY.

JOINT FOR COUPLING UNDERGROUND CABLES.

SPECIFICATION forming part of Letters Patent No. 415,751, dated November26, 1889.

Application filed February 4, 1887. Serial No. 226,568. (No model.)Patented in Germany April 2'7, 1887, No. 42,256 and No. 43,673; inEngland September 2, 1887, No. 11,932; in France December 20, 1887, No.187,711, and in Austria-Hungary Pebruary 1 8,1888,N0.44,6 11 and No.5,218.

T at whom, it may concern:

Be it known that we, BROR I-IEMMING VESS- LAU and GEORG TRAUTWEIN, bothof Charlottenburg, in the German Empire, have in- 5 vented certain newand useful Improvements in Joints for Coupling Underground Cables, I(which have been patented in the German Empire by Letters Patent No.42,256 and No. 43,673, of April 27, 1887; in England by Letters PatentNo. 11,932, of September 2, 1887; in France by Letters Patent No.187,711, of December 20, 1887, and in Austria-Hungary by Letters PatentNo. 44,641, Tom. 38, Fol. 351, and No. 5,213, Tom. XXII, Fol. 325, of

. I 5 February 18, 1888,) of which the following is a specification.

Our invention relates to means'for coupling underground electricalcables having a central conductor and another conductor concentricthereto; and it consists in apparatus for joining the said conductorsand for pro tecting the joint formed thereby, and in the combination andarrangement of the parts thereof, as will be hereinafter fullydescribed, 2 5 and pointed out in detail in the claims.

Couplings for underground cables have to fulfill two principalrequirements. In the first place they must be safe mechanically andelectrically, and, secondly, they must be so constructed as to preventthe permeation of moisture into the insulating-layers thereof. WVeobtain these objects by the use of the apparatus shown in theaccompanying drawings, and in which corresponding parts are designatedby similar letters.

Referring thereto, Figure 1 is a side view, partially sectional, of anend closure for a cable having its central conductor formed of a singleWire and constructed according to our invention. Fig. 2 is a side View,partially sectional, of an end closure adapted for use with a cable, thecentral conductor of which consists of a number of wires twisted into astrand. Fig. 3 is a side view, partially sectional, of a coupling forconnecting two cables, showing the side of the protective cas ing brokenaway. Fig. i is a top view of Fig. 3. Fig. 5 is a Vertical section online a; as of Fig. 3. Fig. 6 is a top view, having a part of theprotective casing broken away, of apparatus used for connecting threecables meeting at a certain point. Fig. 7 is a top plan view, having theprotective casing broken away, of apparatus used for connecting a branchcable in series with a throughgoing cable. I

In order to connect a cable constructed in the manner described withother conductors, the several layers of the cable are cutoff into steps,so that a part of the central conductor a, part of the insulating-layerZ: surrounding it, part of the concentric conductor 0 surrounding thesaid layer, partof the insulating cl about the conductor 0, and part ofthe lead covering 6, surrounded by a wire covering 6, will be exposed.Upon the exposed end of the concentric conductor 0 is shoved a tube f,having a flange g on the rear end thereof. Upon the insulating-layer bis shoved a tube h, having a flange I; upon the forward end thereof.Between the two flanges g and i the wires of the concentric conductor aare turned outward and held securely therebetween by means of the screwsj, working in threaded holes in the flanges. The flange '5 receivesanother threaded hole for the reception of a screw m, by which aconductor may be attached, and thus an electrically and mechanicallysafe connection formed with the said concentric conductor. Upon thecable end thus prepared three bands 0, p, and q of insulating-tape arewound. The first band 0 surrounds a part of the central conductor, partof the insulating-layer b, and part of the tube It. The second band 13surrounds the flanges g and 1', while the third band (1 sur rounds thetube f, part of the insulating-layer (I, lead covering 6, and part ofthe wire covering 6, thus preventing moisture from permeating theinterior of the cable and de- 0 stroying its insulation. It is evidentthat the conductor a may be connected to other conductors in the usualand known manner.

Fig. 2 illustrates an end closure for use with cables having a centralconductor com- 5 posed of a number of wires twisted up .into a strand.In this case a. metal tube 0", terminating in a flat end piece 8 andhaving a female screw-thread 25 upon its interior, is screwed upon suchcentral conductor. The

a the said central conductor.

solid end piece 5- has a screw it for "attaching a conductor thereto andconnecting it with Over this tube 0' is wound the band 0 ofinsulating-tape referred to in Fig. 1, and which also covers theinsulating-layer b and tubeh, while the remaining parts are similar tothose shown in Fig. 1.

To connect two cables of the kind described with each other,we use thearrangement shown in Figs. 3, 4, and 5, and to protect the joint theprotective box or casing shown therein is used. This box consists of twoflanged halves c and w, adapted to be fastened together by screws orbolt-s 03' 0c, the upper half 1; of the box having an upward extensiony, in which is a plug .2, provided with a screw-thread, and which may beremoved to fill the box with insulating material. Into this box thecable ends, which have had the several layers thereof cut into steps, asdescribed, and provided with the flanged tubes f and h, are introduced,the concentric conductors thereof being united by rods A, havingscrew-threads upon their ends adapted to receive two pairs of nuts B B,by which means the flanges g and 7; are drawn together, thus dispensingwith the screws j and m.

To connect the central conductors of the cables with each other, twogrooved metal blocks 0 are used, between which the uncovered end of thesaid conductor is placed and the blocks firmly drawn together by meansof a screw D. p

The cable ends may be introduced into the box in any manner that willmake the introduction thereof hermetical, and the flanged halves of thebox may be also provided with means for making their connectionwatertight.

For uniting three cables meeting at a certain point with. one anotherand protecting their joint, the apparatus is used illustrated in Fig. 6.The protective casing is similar to that shown in Figs. 3, 4, and 5,except that it has a side or lateral extension to receive the extracable.

Curved rods E E connect the flanges of the tubes on the cable with eachother, while the blocks 0 receive an extra groove for the central cable.

When it is desired to connect in series a branch cable with a mainthroughgoing one, the flanges g t' on one end F of the maingoing cableare connected to the flanges g i on the branch cable G by means of thecurved rod E, having nuts upon its ends, while the central conductors ofthe said throughgoing cable are united by the grooved blocks 0. Thecentral conductor of the branch cable is connected to the concentricconductor of the end II of the throughgoing cable by means of theflat-pointed screw-spindle I, connector .I, and screw K.

Having now described our invention, what we claim, and desire to secureby Letters Patent, is

1. In a coupling for cables having a concentric wire conductor woundaround a layer of insulating material, the combination of two flangedtubes, one of the said tubes being shoved upon. the said conductor andthe other upon the insulating material, means for drawing the flangesthereon together, and a clampingscrew adapted to receive a conductor, asand for the purpose described.

2. In a coupler forcables having a central conductor separated from aconductor concentric therewith by a layer of insulating materiahthecombination of two tubes provided with flanges, one of the said tubesbeing shoved upon the concentric copper conducto r and the other uponthe insulatinglayer, means for drawing the said flanges together, and aribbon of insulating material wound around the said parts, as and forthe purpose described.

In a coupling for the electrical connection of cables having concentricconductors, the combination of two flanged tubes upon each cable andconductingrods having threads upon their ends for the reception ot'nuts, whereby the said tubes on each cable may be drawn together and thecables con nected with each other, as and for the purpose described.

4. In a coupling for the electrical connection of cables having acentral conductor insulated from conductors concentric therewith by alayer of insulating material, the combination of ,two grooved metalblocks, means for drawing the said blocks together,whereby the centralconductors are connected with each other, two flanged tubes upon eachcable, and conducting-rods having threads upon their ends for thereception of nuts, whereby the tubeson each cable may be drawn togetherand the cables connected with each other, as and for the purposedescribed.

5. In a coupling for the connection in series of a branch cable having acentral conductor separated froma conductor. concentric therewith by alayer of insulating material with a like main throughgoing cable, thecombination of grooved metal blocks for the reception of the ends of thesaid central conductor of the main cable, two tubes provided withflanges upon each of the said cables, conducting-rods adapted to connectthe said tubes upon one end of the main cable with the tubes upon thebranch conductor, and means for connecting the central cable of the saidbranch cable with the tubes upon the other end of the main cable, as andfor the purpose described.

In testimony that we claim the foregoing we have hereunto set our handsthis 20th day of December, 1886.

BROR IIEMMING WESSLAU. GEORG TRAUTWEIN.

Witnesses:

B. ROI, M. W. MOORE.

